Inyhome Welcome!
You have just moved to what I think is the best climate in the entire country! I actually like Portland better than Seattle- a bit hotter in summer, a bit colder in winter, and a bit less dark in winter. I am also from the midwest so I like seasons with actual winter (if short).
I agree about the size of plants, and this applies to most perennials and shrubs too, so don't plant new ornamental gardens based on the listed sizes. Some are actually twice the listed size. Where you live now, spring starts in January! Plus, in an hour you are at the ocean. Make sure you go to Haystack Rock and see the tide pools.
The greenhouse is great, I don't have one so I am a bit envious. Interestingly, I do some cuttings in fall most years, I keep them in a plastic cold frame in shade under a cedar tree, so it is cool and dim (and dry). I have better success with my woody cuttings than my sister did who took some last fall and put them in her new greenhouse. So I think a greenhouse is a learning process.
It sounds like you will do some vegetable gardening. As the heat is less in summer here, tomatoes and other tropicalish crops are challenging. Check out Territorial Seeds- they sell varieties for your climate. There was a professor at OSU who bred tomatoes for cool climates, Territorial sells them and you can find them in nurseries if you look.
